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build/xilinx/vivado: Move false path generation to _build_false_path_constraints.

This commit is contained in:
Florent Kermarrec 2024-12-02 16:34:59 +01:00
parent 30aeaf544a
commit 3ba9217122
1 changed files with 18 additions and 10 deletions
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28
litex/build/xilinx/vivado.py
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@ -176,16 +176,8 @@ class XilinxVivadoToolchain(GenericToolchain):
self.platform.add_platform_command(
"create_clock -name {name} -period " + str(period) +
" [get_" + get_clk_type(clk) + " {clk}]", name=name, clk=clk)
for _from, _to in sorted(self.false_paths, key=lambda x: (x[0].duid, x[1].duid)):
self.platform.add_platform_command(
"set_clock_groups "
"-group [get_clocks -include_generated_clocks -of [get_" + get_clk_type(_from) + " {_from}]] "
"-group [get_clocks -include_generated_clocks -of [get_" + get_clk_type(_to) + " {_to}]] "
"-asynchronous",
_from=_from, _to=_to)
# Make sure add_*_constraint cannot be used again
# Make sure add_period_constraint cannot be used again.
self.clocks.clear()
self.false_paths.clear()
def _build_false_path_constraints(self):
self.platform.add_platform_command(_xdc_separator("False path constraints"))
@ -194,7 +186,7 @@ class XilinxVivadoToolchain(GenericToolchain):
"set_false_path -quiet "
"-through [get_nets -hierarchical -filter {{mr_ff == TRUE}}]"
)
# The asychronous reset input to the AsyncResetSynchronizer is a false path
# The asynchronous reset input to the AsyncResetSynchronizer is a false path
self.platform.add_platform_command(
"set_false_path -quiet "
"-to [get_pins -filter {{REF_PIN_NAME == PRE}} "
@ -208,6 +200,22 @@ class XilinxVivadoToolchain(GenericToolchain):
"-to [get_pins -filter {{REF_PIN_NAME == D}} "
"-of_objects [get_cells -hierarchical -filter {{ars_ff2 == TRUE}}]]"
)
# Add false paths between clocks
def get_clk_type(clk):
return {
False: "nets",
True: "ports",
}[hasattr(clk, "port")]
for _from, _to in sorted(self.false_paths, key=lambda x: (x[0].duid, x[1].duid)):
self.platform.add_platform_command(
"set_clock_groups "
"-group [get_clocks -include_generated_clocks -of [get_" + get_clk_type(_from) + " {_from}]] "
"-group [get_clocks -include_generated_clocks -of [get_" + get_clk_type(_to) + " {_to}]] "
"-asynchronous",
_from=_from, _to=_to)
# Make sure add_false_path_constraint cannot be used again.
self.false_paths.clear()
def build_timing_constraints(self, vns):
# FIXME: -> self ?